Charging system

ABSTRACT

The present disclosure provides a charging system that includes a charging adapter and a mobile terminal. The charging adapter includes: a second USB interface; and an adjusting circuit for rectifying and filtering the mains supply to obtain an original power signal, for performing a voltage adjustment on the original power signal, and for outputting a power signal after the voltage adjustment. The mobile terminal includes a first USB interface. P first power wires in the first USB interface and P second power wires in the second USB interface are correspondingly coupled, and Q first ground wires in the first USB interface and Q second ground wires in the second USB interface are correspondingly coupled. Because each first power wire and a corresponding second power wire are coupled, at least two charging circuits can be provided, and the charging system supports charging with a large current more than 3 A.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. national phase applicationSer. No. 15/114,870, filed on Jul. 28, 2016, which is based onInternational Application No. PCT/CN2014/077432, filed on May 14, 2014,and claims priority to Chinese Patent Application No. 201410043182.0,filed on Jan. 28, 2014, the entire contents of which are incorporatedherein by reference.

TECHNICAL FIELD

The present disclosure relates to mobile terminal field, and moreparticularly, to a charging system.

BACKGROUND

With the progress of the times, the internet and mobile communicationnetwork provide massive functions and applications. A user not only canuse a mobile terminal to perform conventional applications, such as usea smart phone to answer a call or call somebody up, but also can use themobile terminal to browse a webpage, transmit a picture or play a gameand so on.

When the mobile terminal is used to handle matters, a huge quantity ofelectricity in a cell of the mobile terminal is consumed due to theincreased usage frequency of the mobile terminal, such that it isrequired to charge the mobile terminal frequently. Since the pace oflife becomes more and more fast, particularly, emergencies become moreand more frequent, the user wants to charge the cell of the mobileterminal with large current.

When a charging adapter is used to charge the mobile terminal in therelated art, MICRO USB interfaces (including a MICRO USB plug in thecharging adapter and a MICRO USB socket in the mobile terminal) aregenerally adopted for charging via insertion-connection. Since the MICROUSB interface includes only one power wire and only one ground wire, thecharging can be performed through only one charging circuit formed bythe only one power wire and the only one ground wire. Therefore, it onlysupports the charging current not greater than 3 A, so that the chargingspeed is slow and time is wasted.

SUMMARY

The present disclosure relates to a charging system.

In at least one embodiment of the present disclosure, a charging systemis provided. The charging system includes a charging adapter and amobile terminal

The charging adapter includes: a second USB interface, having P secondpower wires, Q second ground wires and N second data wires, where P isgreater than or equal to 2, Q is greater than or equal to 2, and N isgreater than or equal to 1; and an adjusting circuit, having a powerterminal, a power signal output terminal and a ground signal outputterminal, the power terminal being coupled to an external mains supply,the power signal output terminal being coupled to each of the P secondpower wires, the ground signal output terminal being coupled to each ofthe Q second ground wires, and the adjusting circuit being configured toperform a rectifying and a filtering on the mains supply to obtain anoriginal power signal, to perform a voltage adjustment on the originalpower signal and to output a power signal after the voltage adjustmentvia the power signal output terminal.

The mobile terminal include a first USB interface having P first powerwires, Q first ground wires and N first data wires, the P first powerwires of the first USB interface being insertion-connected with the Psecond power wires of the second USB interface correspondingly, the Qfirst ground wires of the first USB interface being insertion-connectedwith the Q second ground wires of the second USB interfacecorrespondingly, and the N first data wires of the first USB interfacebeing insertion-connected with the N second data wires of the second USBinterface correspondingly.

The mobile terminal further includes: a first controller, having asample terminal and a first data terminal, the first data terminal beingcoupled to one or more first data wires of the first USB interface, andthe first controller being configured to receive a voltage value of acell output by a cell connector via the sample terminal and to send thevoltage value of the cell via the first data terminal; and a switchcircuit, having a cell terminal, a charging terminal, a first controlledterminal and a second controlled terminal, the cell terminal beingcoupled to an anode of the cell, the charging terminal being coupled tothe first power wires of the first USB interface, the first controlledterminal being coupled to a first control terminal of the firstcontroller, the second controlled terminal being coupled to a secondcontrol terminal of the first controller, and the switch circuit beingconfigured to couple the charging terminal with the cell terminal whenreceiving via the first controlled terminal a coupling instruction sentby the first controller, such that the charging adapter charges thecell; and to switch off a coupling between the charging terminal and thecell terminal when receiving via the second controlled terminal a firstswitch-off instruction sent by the first controller, such that thecharging adapter stops charging the cell.

The switch circuit includes a second capacitor, a third capacitor, asecond resistor, a third resistor, a fourth resistor, a fifth resistor,a first Schottky diode, a second Schottky diode, a third Schottky diode,a NPN triode and a switch module. A first terminal of the secondresistor, a second terminal of the switch module, a first terminal ofthe second capacitor and a second terminal of the second resistor areconfigured as the cell terminal, the charging terminal, the firstcontrolled terminal and the second controlled terminal of the switchcircuit respectively, a first terminal and a second terminal of thethird resistor are coupled to the second terminal of the second resistorand a base electrode of the NPN triode respectively, an anode and acathode of the third Schottky diode are coupled to an emitter electrodeof the NPN triode and ground respectively, an anode and a cathode of thefirst Schottky diode are coupled to the first terminal of the secondresistor and a second terminal of the second capacitor respectively, ananode and a second cathode of the second Schottky diode are coupled tothe second terminal of the second capacitor and a first terminal of thefourth resistor respectively, a first terminal and a second terminal ofthe third capacitor are coupled to the cathode of the first Schottkydiode and ground respectively, a first terminal and a second terminal ofthe fifth resistor are coupled to a second terminal of the fourthresistor and ground respectively, a collector electrode of the NPNtriode is coupled to the second terminal of the fourth resistor, and afirst terminal and a controlled terminal of the switch module arecoupled to the first terminal of the second resistor and the secondterminal of the fourth resistor respectively.

DRAWINGS DESCRIPTION

In order to make the technical solutions of embodiments of the presentdisclosure more clearly, the accompanying drawings used in thedescription of embodiments of the present disclosure or of the relatedart are briefly described hereunder. Obviously, the described drawingsare merely some embodiments of present disclosure. For persons skilledin the art, other drawings may be obtained based on these drawingswithout any creative work.

FIG. 1 is a schematic diagram of a charging system provided by anembodiment of the present disclosure.

FIG. 2 is a schematic diagram showing an internal structure of a USBinterface provided by an embodiment of the present disclosure.

FIG. 3 is a schematic diagram showing a charging circuit in a mobileterminal of a charging system provided by an embodiment of the presentdisclosure.

DETAILED DESCRIPTION

To make the objectives, the technical solutions, and the advantages ofembodiments of the present disclosure clearer, the present disclosure ishereinafter further described with reference to the accompanyingdrawings and embodiments. It should be understood that, the describedembodiments are merely used to understand the present disclosure, butshall not be construed to limit the present disclosure. In order toexplain the technical solutions of the present disclosure, specificembodiments will be described as follows.

A charging adapter in embodiments of the present disclosure includes aterminal capable of outputting a power signal to charge a cell (a cellof a mobile terminal), such as a power adapter, a charger, an IPAD and asmart phone.

Embodiments of the present disclosure provide a first USB (UniversalSerial Bus) interface, which is disposed in a mobile terminal and can beconfigured for transmitting a power signal. Meanwhile, embodiments ofthe present disclosure provide a second USB interface, which is disposedin a charging adapter. When the first USB interface isinsertion-connected with the second USB interface, each first power wirein the first USB interface is insertion-connected with each second powerwire in the second USB interface correspondingly, and thus at least twocharging circuits can be provided, thereby realizing charging with largecurrent greater than 3 A.

FIG. 1 is a schematic diagram of a charging system provided by anembodiment of the present disclosure, which only shows parts related tothe present disclosure. Meanwhile, FIG. 2 shows an internal structure ofthe first USB interface 1. In at least one embodiment, FIG. 2 is merelyused to schematically illustrate the first USB interface 1 provided byembodiments of the present disclosure, and thus only the structurediagram with two power wires, two ground wires and three data wires isshown. In at least one embodiment, the internal structure of the secondUSB interface 2 in the charging adapter corresponds to the internalstructure of the first USB interface 1 in the mobile terminal, forexample, each first power wire in the first USB interface 1 isinsertion-connected with each second power wire in the second USBinterface 2 correspondingly, and each first data wire in the first USBinterface 1 is insertion-connected with each second data wire in thesecond USB interface 2 correspondingly, and thus a schematic diagram ofthe second USB interface 2 is not shown in embodiments of the presentdisclosure.

Referring to FIG. 1 in combination with FIG. 2, the charging systemprovided by embodiments of the present disclosure includes the chargingadapter and the mobile terminal

The charging adapter includes the second USB interface 2. The second USBinterface 2 has P second power wires, Q second ground wires and N seconddata wires, where P is greater than or equal to 2, Q is greater than orequal to 2, and N is greater than or equal to 1.

The charging adapter includes an adjusting circuit 3. The adjustingcircuit 3 has a power terminal, a power signal output terminal and aground signal output terminal. The power terminal is coupled to anexternal mains supply. The power signal output terminal is coupled toeach of the P second power wires. The ground signal output terminal iscoupled to each of the Q second ground wires. The adjusting circuit 3 isconfigured to perform a rectifying and a filtering on the mains supplyto obtain an original power signal, to perform a voltage adjustment onthe original power signal, and to output a power signal after thevoltage adjustment via the power signal output terminal.

The mobile terminal includes the first USB interface 1. The first USBinterface 1 has P first power wires, Q first ground wires and N firstdata wires. The P first power wires of the first USB interface 1 areinsertion-connected with the P second power wires of the second USBinterface 2 correspondingly. The Q first ground wires of the first USBinterface 1 are insertion-connected with the Q second ground wires ofthe second USB interface 2 correspondingly. The N first data wires ofthe first USB interface 1 are insertion-connected with the N second datawires of the second USB interface 2 correspondingly.

In the present embodiment, when there is a need to charge the cell ofthe mobile terminal with the charging adapter, the user willinsertion-connect the first USB interface 1 with the second USBinterface 2, and thus, the P first power wires of the first USBinterface 1 are insertion-connected with the P second power wires of thesecond USB interface 2 correspondingly, the Q first ground wires of thefirst USB interface 1 are insertion-connected with the Q second groundwires of the second USB interface 2 correspondingly, and the N firstdata wires of the first USB interface 1 are insertion-connected with theN second data wires of the second USB interface 2 correspondingly.Therefore, at least two charging circuits (the number of the chargingcircuits is equal to a minimum of P and Q) can be provided when the cellis charged. The current supported by each charging circuit may be atleast equal to the current supported by the existing charging circuit(the one charging circuit provided by existing MICRO USB interfaces),and thus the first USB interface 1 and the second USB interface 2provided by embodiments of the present disclosure can support largercharging current (equal to or greater than 3 A) compared to the existingUSB interfaces (providing only one charging circuit).

Further, the adjusting circuit 3 performs the rectifying and filteringon the mains supply inputted via the power terminal to obtain theoriginal power signal. Then, the voltage of the original power signal isadjusted and the power signal after the voltage adjustment is outputted.The cell of the mobile terminal is charged with the power signal afterthe voltage adjustment, in which charging current equal to or greaterthan 3 A can be supported.

In at least one embodiment, when the first USB interface 1 is configuredas a USB plug, the second USB interface is configured as a USB socket.In contrast, when the first USB interface 1 is configured as the USBsocket, the second USB interface 2 is configured as the USB plug. Inthis way, it may ensure a good insertion-connection between the firstUSB interface 1 and the second USB interface 2, including goodinsertion-connections between the Q first ground wires of the first USBinterface 1 and the Q second ground wires of the second USB interface 2,and good insertion-connections between the N first data wires of thefirst USB interface 1 and N second data wires of the second USBinterface 2.

In at least one embodiment, since the first USB interface 1 and thesecond USB interface 2 can withstand large current (equal to or greaterthan 3 A), the mobile terminal can drive another mobile terminal (havingthe second USB interface 2) to work via the first USB interface 1.

In another embodiment of the present disclosure, the mobile terminalfurther includes a first controller 6.

The first controller 6 has a sample terminal and a first data terminal.The first data terminal is coupled to one or more first data wires ofthe first USB interface 1. The first controller 6 is configured toreceive a voltage value of the cell output by a cell connector via thesample terminal, and to send the voltage value of the cell via the firstdata terminal.

In at least one embodiment, the cell connector samples the electricquantity of the cell (the voltage value of the cell) of the mobileterminal in real time. Meanwhile, the first controller 6 receives thevoltage value of the cell outputted by the cell connector in real time,and sends the voltage value of the cell via the first data terminal,such that the voltage value of the cell is sent to a second controller 7via the first USB interface 1 and the second USB interface 2.

In another embodiment of the present disclosure, the charging adapterfurther includes a second controller 7.

The second controller 7 has a control terminal and a third data terminalThe control terminal is coupled to a controlled terminal of theadjusting circuit 3. The third data terminal is coupled to one or moresecond data wires of the second USB interface 2. The second controller 7is configured to receive the voltage value of the cell of the mobileterminal via the third data terminal, to compare the voltage value ofthe cell with a preset voltage value, and to send an adjustmentinstruction via the control terminal according to a comparison result.

The adjusting circuit 3 is specifically configured to perform thevoltage adjustment on the original power signal according to theadjustment instruction received and to output a power signal with apreset current value via the power signal output terminal.

The preset voltage value is set according to actual charging needs. Thepreset voltage value is set such that, when the voltage of the cell ishigh enough, the charging current is reduced to the preset current value(a current value less than 3 A) for charging with small current (thecharging current less than 3 A).

In the present embodiment, the second controller 7 receives the voltagevalue of the cell of the mobile terminal via the third data terminalThen, if the voltage value of the cell is less than the preset voltagevalue, no adjustment instruction is outputted; if the voltage value ofthe cell is equal to or greater than the preset voltage value, theadjustment instruction is outputted, and the adjusting circuit 3 reducesthe current value of the power signal outputted from the power signaloutput terminal to the preset current value according to the adjustmentinstruction.

In another embodiment of the present disclosure, the adjusting circuit 3further includes a current detection circuit 31.

A detection output terminal of the current detection circuit 31 iscoupled to a calibration terminal of the second controller 7. Thecurrent detection circuit 31 is configured to detect the current valueof the power signal via a detection resistor, and to send the currentvalue detected to the second controller 7.

The second controller 7 is further configured to send a calibrationinstruction to the adjusting circuit 3 if the current value detected isnot equal to the preset current value.

The adjusting circuit 3 is further configured to re-perform the voltageadjustment on the original power signal according to the calibrationinstruction, and to output a calibrated power signal via the powersignal output terminal.

In the present embodiment, after the adjusting circuit 3 reduces thecurrent value of the power signal outputted from the power signal outputterminal to the preset current value according to the adjustmentinstruction, in order to further ensure the current value of the powersignal outputted by the adjusting circuit 3 via the power signal outputterminal equal to the preset current value, the current detectioncircuit 3 detects the current value of the power signal outputted fromthe power signal output terminal in real time via the detection resistorthereof, and then sends the current value detected to the secondcontroller 7 in real time; further, if the current value detected is notequal to the preset current value, the second controller 7 sends thecalibration instruction to the adjusting circuit 3, and the adjustingcircuit 3 re-adjusts the voltage of the original power signal andoutputs the re-adjusted power signal (i.e., the calibrated powersignal), such that it ensures that the current value of the re-adjustedpower signal is equal to the preset current value.

In another embodiment of the present disclosure, the mobile terminalfurther includes a switch circuit 4.

The switch circuit 4 has a cell terminal, a charging terminal, a firstcontrolled terminal and a second controlled terminal. The cell terminalis coupled to an anode of the cell. The charging terminal is coupled tothe first power wires of the first USB interface 1. The first controlledterminal is coupled to a first control terminal of the first controller6. The second controlled terminal is coupled to a second controlterminal of the first controller 6. The switch circuit 4 is configuredto couple the charging terminal with the cell terminal when receivingvia the first controlled terminal a coupling instruction sent by thefirst controller 6, such that the charging adapter charges the cell. Theswitch circuit 4 is configured to switch off a coupling between thecharging terminal and the cell terminal when receiving via the secondcontrolled terminal a first switch-off instruction sent by the firstcontroller 6, such that the charging adapter stops charging the cell.

In at least one embodiment, the cell connector included in the mobileterminal is further configured to generate an anode contact signal whendetecting whether the anode of the cell is contacted, to generate acathode contact signal when detecting whether a cathode of the cell iscontacted, to generate an electric quantity signal when detecting anelectric quantity of the cell, and to send the anode contact signal, thecathode contact signal and the electric quantity signal to the firstcontroller 6.

Further, the first controller 6 can determine whether a positivecharging contact point of the charging circuit of the mobile terminal iswell contacted with the anode of the cell according to the anode contactsignal, can determine whether a negative charging contact point of thecharging circuit of the mobile terminal is well contacted with thecathode of the cell according to the cathode contact signal, and candetermine whether the voltage of the cell exceeds a voltage thresholdaccording to the electric quantity signal.

If it is detected that the positive charging contact point is welledcontacted with the anode of the cell, the negative charging contactpoint is well contacted with the cathode of the cell, and the voltage ofthe cell is less than the voltage threshold, the first controller 6sends a coupling instruction to the switch circuit 4. Thus, when theswitch circuit 4 receives via the first controlled terminal the couplinginstruction sent by the first controller 6, the switch circuit 4 couplesthe charging terminal with the cell terminal, and the charging adaptercan charge the cell of the mobile terminal via the switch circuit 4.

If it is detected that the positive charging contact point is not wellcontacted with the anode of the cell, the negative charging contactpoint is not well contacted with the cathode of the cell, and thevoltage of the cell is higher than the voltage threshold, the firstcontroller 6 sends the first switch-off instruction to the switchcircuit 4 in time. Then, when the switch circuit 4 receives via thesecond controlled terminal the first switch-off instruction sent by thefirst controller 6, the switch circuit 4 switches off the couplingbetween the charging terminal and the cell terminal, such that thecharging adapter is stopped from charging the cell.

In another embodiment of the present disclosure, the mobile terminalfurther includes an anti-reverse circuit 5.

The anti-reverse circuit 5 has a high potential terminal, a lowpotential terminal and a control output terminal The high potentialterminal is coupled to the first power wires of the first USB interface1. The low potential terminal is coupled to the first ground wires ofthe first USB interface 1. The control output terminal is coupled to athird controlled terminal of the switch circuit 4. The anti-reversecircuit 5 is configured to send a second switch-off instruction to theswitch circuit 4 when a ground signal is coupled to the high potentialterminal and a power signal is coupled to the low potential terminal,such that the switch circuit 4 switches off the coupling between thecharging terminal and the cell terminal

In the present embodiment, in order to avoid that the ground signal iscoupled to the anode of the cell and the power signal is coupled to thecathode of the cell when the cell is charged, it is detected whether thepower signal and the ground signal are reversely coupled (for example,the first USB interface 1 and the second USB interface 2 are reverselycoupled, such that the electric signal coupled to the first power wiresof the first USB interface 1 is the ground signal, and the electricsignal coupled to the first ground wires of the first USB interface 1 isthe power signal) at the high potential terminal and the low potentialterminal, thereby ensuring that the electric signal coupled to the firstpower wires of the first USB interface 1 is the power signal and theelectric signal coupled to the first ground wires of the first USBinterface 1 is the ground signal.

In addition, if the electric signal coupled to the first power wires ofthe first USB interface 1 is the ground signal, and the electric signalcoupled to the first ground wires of the first USB interface 1 is thepower signal, the anti-reverse circuit 5 will sends the secondswitch-off instruction to the switch circuit 4, and then the switchcircuit 4 switches off the electric coupling between the chargingterminal and the cell terminal in time, so as to stop the chargingadapter from charging the cell of the mobile terminal In this way, ananti-reverse protection can be performed for the cell of the mobileterminal and the internal circuit (including the charging circuit) ofthe mobile terminal.

FIG. 3 shows a specific diagram of the charging circuit in the mobileterminal of the charging system provided by embodiments of the presentdisclosure. For illustration, only parts related to embodiments of thepresent disclosure are described.

In at least one embodiment, the switch circuit 4 includes a secondcapacitor C2, a third capacitor C3, a second resistor R2, a thirdresistor R3, a fourth resistor R4, a fifth resistor R5, a first Schottkydiode D11, a second Schottky diode D12, a third Schottky diode D13, aNPN triode Q1 and a switch module 41.

A first terminal of the second resistor R2, a second terminal of theswitch module 41, a first terminal of the second capacitor C2, and asecond terminal of the second resistor R2 are configured as the cellterminal, the charging terminal, the first controlled terminal, and thesecond controlled terminal of the switch circuit 4, respectively. Afirst terminal and a second terminal of the third resistor R3 arecoupled to the second terminal of the second resistor R2 and a baseelectrode of the NPN triode Q1, respectively. An anode and a cathode ofthe third Schottky diode D13 are coupled to an emitter electrode of theNPN triode Q1 and ground, respectively. An anode and a cathode of thefirst Schottky diode D11 are coupled to the first terminal of the secondresistor R2 and a second terminal of the second capacitor C2,respectively. An anode and a cathode of the second Schottky diode D12are coupled to the second terminal of the second capacitor C2 and afirst terminal of the fourth resistor R4, respectively. A first terminaland a second terminal of the third capacitor C3 are coupled to thecathode of the first Schottky diode D11 and ground, respectively. Afirst terminal and a second terminal of the fifth resistor R5 arecoupled to a second terminal of the fourth resistor R4 and ground,respectively. A collector electrode of the NPN triode Q1 is coupled tothe second terminal of the fourth resistor R4. A first terminal and acontrolled terminal of the switch module 41 are coupled to the firstterminal of the second resistor R2 and the second terminal of the fourthresistor R4, respectively.

In practical use, when the coupling instruction (the couplinginstruction with high potential) is received via the first controlledterminal, the controlled terminal of the switch module 41 also receivesthe electric signal with high potential. Further, the second terminal ofthe switch module 41 is electrically coupled with the first terminal ofthe switch module 41, thereby forming an electric path from the chargingterminal to the cell terminal via the switch module 41. Therefore, thepower signal inputted via the first power wires of the first USBinterface 1 can charge the cell of the mobile terminal via the switchcircuit 4.

When the first switch-off instruction with high potential is receivedvia the second controlled terminal, the NPN triode Q1 is switched on,and then the controlled terminal of the switch module 41 receives theelectric signal with low potential, which switches off the electriccoupling between the second terminal and the first terminal of theswitch module 41, thereby switching off the electric path from thecharging terminal to the cell terminal, and stopping charging the cellof the mobile terminal via the switch circuit 4.

In at least one embodiment, the switch module 41 includes a third switchchip U3 and a fourth switch chip U4. A source pin S3 of the third switchchip U3, a source pin S4 of the fourth switch chip U4, and a gate pin G4of the fourth switch chip U4 are configured as the second terminal, thefirst terminal and the controlled terminal of the switch module 41,respectively. A gate pin G3 and a drain pin D3 of the third switch chipU3 are coupled to the gate pin G4 and a drain pin D4 of the fourthswitch chip U4, respectively.

In the present embodiment, when the controlled terminal of the switchmodule 41 receives the electric signal with high potential, the gate pinG3 of the third switch chip U3 and the gate pin G4 of the fourth switchchip U4 also receive the electric signal with high potential, and thusthe source pin S3 of the third switch chip U3 is electrically conductedto the drain pin D3, and the source pin S4 of the fourth switch chip U4is electrically conducted to the drain pin D4, thereby forming anelectric path between the source pin S3 of the third switch chip U3 andthe source pin S4 of the fourth switch chip U4, and the first terminalof the switch module 41 being electrically coupled with the secondterminal of the switch module 41.

In contrast, when the controlled terminal of the switch module 41receives the electric signal with low potential, the gate pin G3 of thethird switch chip U3 and the gate pin G4 of the fourth switch chip U4also receive the electric signal with low potential, and thus the sourcepin S3 of the third switch chip U3 cannot be electrically conducted tothe drain pin D3, and the source pin S4 of the fourth switch chip U4cannot be electrically conducted to the drain pin D4, thereby notforming an electric path between the source pin S3 of the third switchchip U3 and the source pin S4 of the fourth switch chip U4, and thefirst terminal of the switch module 41 being not electrically coupledwith the second terminal of the switch module 41. Thus, the power signalinputted via the high potential charging input terminal cannot chargethe cell of the mobile terminal via the switch circuit 4.

In at least one embodiment, the anti-reverse circuit 5 includes a sixthresistor R6, a first NMOS transistor Q2 and a second NMOS transistor Q3.

A source electrode of the first NMOS transistor Q2, a second terminal ofthe sixth resistor R6, and a source electrode of the second NMOStransistor Q3 are configured as the high potential terminal, the lowpotential terminal and the control output terminal of the anti-reversecircuit 5, respectively. A grid electrode and a drain electrode of thefirst NMOS transistor Q2 are coupled to a grid electrode and a drainelectrode of the second NMOS transistor Q3, respectively. A firstterminal of the sixth resistor R6 is coupled to the grid electrode ofthe first NMOS transistor Q2.

In at least one embodiment, when the high potential terminal of theanti-reverse circuit 5 is coupled to the ground signal, and the lowpotential terminal is coupled to the power signal, both the first NMOStransistor Q2 and the second NMOS transistor Q3 are switched on, andthen the controlled terminal of the switch module 41 is coupled to theelectric signal with low potential, the first terminal and the secondterminal of the switch module 41 cannot form an electric path, and thusthe charging circuit for the power signal inputted via the highpotential charging input terminal to charge the cell of the mobileterminal via the switch circuit 4 is switched off.

In another embodiment of the present disclosure, each of the first powerwires, the first ground wires, the second power wires and the secondground wires is made of phosphor bronze C7025.

Each of the power wire and the ground wire in the existing MICRO USBinterface for charging the cell of the mobile terminal is made of metalcopper foil with electric conductively less than 20%. However, all ofthe first power wires and the first ground wires in the first USBinterface 1 of the mobile terminal are made of phosphor bronze C7025whose electric conductivity can reach 50%. Correspondingly, all of thesecond power wires and the second ground wires in the second USBinterface 2 of the charging adapter are made of phosphor bronze C7025whose electric conductivity can reach 50%. Thus, compared to theexisting MICRO USB interfaces, the first USB interface 1 and the secondUSB interface 2 provided by embodiments of the present disclosure canwithstand greater charging current.

In another embodiment, each of the first power wires, the first groundwires, the second power wires and the second ground wires is made ofchromium bronze C18400.

In at least one embodiment, all of the first power wires and the firstground wires in the first USB interface 1 of the mobile terminal aremade of chromium bronze C18400 whose electric conductivity can reach70%. Correspondingly, all of the second power wires and the secondground wires in the second USB interface 2 of the charging adapter aremade of chromium bronze C18400 whose electric conductivity can reach70%. Thus, compared to the existing MICRO USB interfaces, the first USBinterface 1 and the second USB interface 2 provided by embodiments ofthe present disclosure can withstand greater charging current.

In this way, compared to the existing MICRO USB interfaces, the firstUSB interface 1 and the second USB interface 2 provided by embodimentsof the present disclosure can withstand greater charging current.Therefore, after the first USB interface 1 is insertion-connected withthe second USB interface 2, the charging adapter can charge the cell ofthe mobile terminal with large current (charging current equal to orgreater than 3 A) via the insertion-connected first USB interface 1 andsecond USB interface 2.

The embodiments described hereinabove are only preferred embodiments ofthe present application, and should not be interpreted as limitation tothe present application. For the persons skilled in the art, variousvariations and modifications may be made to the present application. Anymodifications, equivalent replacements and improvements made within thespirit and principle of the present application are also deemed to fallinto the protection scope of the present application.

What is claimed is:
 1. A charging system, comprising a charging adapterand a mobile terminal, wherein, the charging adapter comprises: a secondUSB interface, having P second power wires, Q second ground wires and Nsecond data wires, wherein P is greater than or equal to 2, Q is greaterthan or equal to 2, and N is greater than or equal to 1; and anadjusting circuit, having a power terminal, a power signal outputterminal and a ground signal output terminal, the power terminal beingcoupled to an external mains supply, the power signal output terminalbeing coupled to each of the P second power wires, the ground signaloutput terminal being coupled to each of the Q second ground wires, andthe adjusting circuit being configured to perform a rectifying and afiltering on the mains supply to obtain an original power signal, toperform a voltage adjustment on the original power signal and to outputa power signal after the voltage adjustment via the power signal outputterminal, the mobile terminal comprises: a first USB interface, having Pfirst power wires, Q first ground wires and N first data wires, the Pfirst power wires of the first USB interface being insertion-connectedwith the P second power wires of the second USB interfacecorrespondingly, the Q first ground wires of the first USB interfacebeing insertion-connected with the Q second ground wires of the secondUSB interface correspondingly, and the N first data wires of the firstUSB interface being insertion-connected with the N second data wires ofthe second USB interface correspondingly, the mobile terminal furthercomprises: a first controller, having a sample terminal and a first dataterminal, the first data terminal being coupled to one or more firstdata wires of the first USB interface, and the first controller beingconfigured to receive a voltage value of a cell output by a cellconnector via the sample terminal and to send the voltage value of thecell via the first data terminal; and a switch circuit, having a cellterminal, a charging terminal, a first controlled terminal and a secondcontrolled terminal, the cell terminal being coupled to an anode of thecell, the charging terminal being coupled to the first power wires ofthe first USB interface, the first controlled terminal being coupled toa first control terminal of the first controller, the second controlledterminal being coupled to a second control terminal of the firstcontroller, and the switch circuit being configured to couple thecharging terminal with the cell terminal when receiving via the firstcontrolled terminal a coupling instruction sent by the first controller,such that the charging adapter charges the cell; and to switch off acoupling between the charging terminal and the cell terminal whenreceiving via the second controlled terminal a first switch-offinstruction sent by the first controller, such that the charging adapterstops charging the cell, the switch circuit comprises a secondcapacitor, a third capacitor, a second resistor, a third resistor, afourth resistor, a fifth resistor, a first Schottky diode, a secondSchottky diode, a third Schottky diode, a NPN triode and a switchmodule; a first terminal of the second resistor, a second terminal ofthe switch module, a first terminal of the second capacitor and a secondterminal of the second resistor are configured as the cell terminal, thecharging terminal, the first controlled terminal and the secondcontrolled terminal of the switch circuit respectively, a first terminaland a second terminal of the third resistor are coupled to the secondterminal of the second resistor and a base electrode of the NPN trioderespectively, an anode and a cathode of the third Schottky diode arecoupled to an emitter electrode of the NPN triode and groundrespectively, an anode and a cathode of the first Schottky diode arecoupled to the first terminal of the second resistor and a secondterminal of the second capacitor respectively, an anode and a secondcathode of the second Schottky diode are coupled to the second terminalof the second capacitor and a first terminal of the fourth resistorrespectively, a first terminal and a second terminal of the thirdcapacitor are coupled to the cathode of the first Schottky diode andground respectively, a first terminal and a second terminal of the fifthresistor are coupled to a second terminal of the fourth resistor andground respectively, a collector electrode of the NPN triode is coupledto the second terminal of the fourth resistor, and a first terminal anda controlled terminal of the switch module are coupled to the firstterminal of the second resistor and the second terminal of the fourthresistor respectively.
 2. The charging system according to claim 1,wherein, the charging adapter further comprises a second controllerhaving a control terminal and a third data terminal, the controlterminal being coupled to a controlled terminal of the adjustingcircuit, the third data terminal being coupled to one or more seconddata wires of the second USB interface, and the second controller beingconfigured to receive the voltage value of the cell of the mobileterminal via the third data terminal, to compare the voltage value ofthe cell with a preset voltage value, and to send an adjustmentinstruction via the control terminal according to a comparison result;the adjusting circuit is configured to perform the voltage adjustment onthe original power signal according to the adjustment instructionreceived and to output a power signal with a preset current value viathe power signal output terminal.
 3. The charging system according toclaim 2, wherein, the adjusting circuit further comprises a currentdetection circuit, a detection output terminal of the current detectioncircuit being coupled to a calibration terminal of the secondcontroller, and the current detection circuit being configured to detecta current value of the power signal via a detection resistor, and tosend the current value detected to the second controller; the secondcontroller is further configured to send a calibration instruction tothe adjusting circuit according to a difference between the currentvalue detected and the present current value; the adjusting circuit isfurther configured to re-perform the voltage adjustment on the originalpower signal according to the calibration instruction, and to output acalibrated power signal via the power signal output terminal.
 4. Thecharging system according to claim 1, wherein, the mobile terminalfurther comprises: an anti-reverse circuit, having a high potentialterminal, a low potential terminal and a control output terminal, thehigh potential terminal being coupled to the first power wires of thefirst USB interface, the low potential terminal being coupled to thefirst ground wires of the first USB interface, the control outputterminal being coupled to a third controlled terminal of the switchcircuit, and the anti-reverse circuit being configured to send a secondswitch-off instruction to the switch circuit when a ground signal iscoupled to the high potential terminal and a power signal is coupled tothe low potential terminal, such that the switch circuit switches offthe coupling between the charging terminal and the cell terminal.
 5. Thecharging system according to claim 1, wherein, the switch modulecomprises a third switch chip and a fourth switch chip; a source pin ofthe third switch chip, a source pin of the fourth switch chip, and agate pin of the fourth switch chip are configured as the secondterminal, the first terminal and the controlled terminal of the switchmodule respectively, and a gate pin and a drain pin of the third switchchip are coupled to the gate pin and a drain pin of the fourth switchchip respectively.
 6. The charging system according to claim 4, wherein,the anti-reverse circuit comprises a sixth resistor, a first NMOStransistor and a second NMOS transistor; a source electrode of the firstNMOS transistor, a second terminal of the sixth resistor, and a sourceelectrode of the second NMOS transistor are configured as the highpotential terminal, the low potential terminal and the control outputterminal of the anti-reverse circuit respectively, a grid electrode anda drain electrode of the first NMOS transistor are coupled to a gridelectrode and a drain electrode of the second NMOS transistorrespectively, and a first terminal of the sixth resistor is coupled tothe grid electrode of the first NMOS transistor.
 7. The charging systemaccording to claim 1, wherein, each of the first power wires, the firstground wires, the second power wires and the second ground wires is madeof phosphor bronze C7025 or chromium bronze C18400.